PadMatch

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Part numberGeneralAire GA10
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Humidifier models
GeneralAire 570 / 3200
Correct pad
GeneralAire GA10
Pad dimensions
10 in W x 9.5 in H x 1.5 in D
Replacement interval
once per heating season

The correct replacement pad for the GeneralAire 570 / 3200, and the sizes that look right but are not.

The GeneralAire 570 / 3200 takes the GeneralAire GA10 pad. Buy that part; a different-size pad lets water bypass into the plenum.
Fits these humidifier models
Fitment notes

The GeneralAire 570 and 3200 drum-type units take the GA10 vapor pad, roughly 10 by 9.5 inches, in the same cross-reference group as the Aprilaire 10.

The GeneralAire small vapor pad, catalogued as part 7900, for the 570 and 3200 units. At 10 by 9.5 inches it sits in the same cross-reference group as the Aprilaire 10 and the small Honeywell pad.

The pad to buy
Search Amazon for GeneralAire GA10 humidifier water panelaffiliate searchFind GeneralAire GA10 humidifier water panel on eBayaffiliate

Find your model

Read the number stamped on the humidifier cabinet or printed on the old pad, then match it below. Confirm the frame size before buying a generic.

GeneralAire 5703200
Related

Sources: GeneralAire GA10 vapor pad for model 570 (Humidifiers.com) ยท General Filters GA10 vapor pad 7900 (Home Depot)